Principles of Mining

Cover Principles of Mining
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Gasoline driven hoists have adistinct place in prospecting and early-stage mining, especially indesert countries where transport and fuel conditions are onerous, for both the machines and their fuel are easy of transport. As directgas-engines entail constant motion of the engine at the power demandof the peak load, they are hopeless in mechanical efficiency.
Like all other motors in mining, the size and arrangement of themotor and drum are dependent upon the duty which they will be calledupon t
...o perform. This is primarily dependent upon the depth to behoisted from, the volume of the ore, and the size of the load. For shallow depths and tonnages up to, say, 200 tons daily, gearedengines have a place on account of their low capital cost. Wheregreat rope speed is not essential they are fully as economical asdirect-coupled engines. With great depths and greater capacities, speed becomes a momentous factor, and direct-coupled engines arenecessary. Where the depth exceeds 3, 000 feet, another elemententers which has given rise to much debate and experiment; thatis, the great increase of starting load due to the increased lengthand size of ropes and the drum space required to hold it.

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